Woke up in the middle of the night feelings soo dehydrated. Dont get it, I drink lots lots of water.…

Woke up in the middle of the night feelings soo dehydrated. Dont get it, I drink lots lots of water. Now I'm trouble getting back to sleep

... I started googling about my dehyration. Found out that the braxton contractions Im having (since week 17-18) could be cuz Im dehydrated. Lately I've noticed Im having more BH than before. Red somewhere that to much BH could cause prelabor. Need to start tracking my BHs. Anyone else having same problem??? I really dont understand since I really do drink lots of water. I walk a lot during day, more than 25miles a week, but I always carry my water with me. How much are u suppose to drink? Isnt 100ounce enough? i probably drink more than that specially the days I do my workouts